Download free 3D Universe screen saver by J. Lechuga
This free 3D screen saver is one of the best available featuring floating stars and planets.
Note that it comes as a scr file ready to run immediately without the need of installations that so often change system settings and tend to be dangerous.
Universe won’t provide any options to change, it’s a take it or leave it deal, but you don’t have anything to lose, since it is free without limitations.
Just unpack the saver in any folder and right click to use the native Windows options of adding a new screen saver to your system.